Antrum Reservoir Report
Nearby: Haivala #1 Sd Noname 132
Last Updated: December 6, 2025
Antrum is a private earth dam located in Harding, South Dakota, along the Trib-S Fork Grand River.
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Summary
Built in 1946, this structure stands at a height of 20 feet and has a length of 900 feet, providing a storage capacity of 240 acre-feet. Despite its age, Antrum is considered to have a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Antrum is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and compliance with regulations. Its primary purpose and associated structures are not specified, but it serves as a vital water resource in the region. Congressman Dusty Johnson represents the area in the U.S. House of Representatives, overseeing federal interests in the dam.
With a maximum discharge capacity of 1050 cubic feet per second, Antrum plays a crucial role in managing water flow and storage in the region. Although lacking recent inspection and assessment data, its low hazard potential suggests a stable structure that continues to support water resource management efforts in the area. Climate and water resource enthusiasts may find Antrum's history and operational details intriguing as they explore the intersection of infrastructure and environmental conservation in South Dakota.
Year Completed |
1946 |
Dam Length |
900 |
Dam Height |
20 |
River Or Stream |
TRIB-S FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
240 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Antrum